CN105843980A - Power inductor evaluation apparatus and power inductor evaluation program - Google Patents
Power inductor evaluation apparatus and power inductor evaluation program Download PDFInfo
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- CN105843980A CN105843980A CN201610059931.8A CN201610059931A CN105843980A CN 105843980 A CN105843980 A CN 105843980A CN 201610059931 A CN201610059931 A CN 201610059931A CN 105843980 A CN105843980 A CN 105843980A
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- 229920006395 saturated elastomer Polymers 0.000 description 5
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/40—Testing power supplies
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/2832—Specific tests of electronic circuits not provided for elsewhere
- G01R31/2836—Fault-finding or characterising
- G01R31/2846—Fault-finding or characterising using hard- or software simulation or using knowledge-based systems, e.g. expert systems, artificial intelligence or interactive algorithms
- G01R31/2848—Fault-finding or characterising using hard- or software simulation or using knowledge-based systems, e.g. expert systems, artificial intelligence or interactive algorithms using simulation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/30—Circuit design
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/30—Circuit design
- G06F30/36—Circuit design at the analogue level
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/30—Circuit design
- G06F30/36—Circuit design at the analogue level
- G06F30/367—Design verification, e.g. using simulation, simulation program with integrated circuit emphasis [SPICE], direct methods or relaxation methods
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/30—Circuit design
- G06F30/36—Circuit design at the analogue level
- G06F30/373—Design optimisation
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/06—Power analysis or power optimisation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/16—Equivalence checking
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
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Abstract
The invention relates to a power inductor evaluation apparatus which is aimed at providing an evaluation apparatus which can select and design optimized power inductor during the design of DC-DC convertor without margin that more than needed. A power inductor evaluation apparatus includes a storage unit(21) and a determination unit (22). The storage unit stores the simulation model (110) of a DC-DC converter. The simulation model includes the equivalent circuit model(110) of a power inductor, including a DC superimposition characteristics slope [alpha] and a saturation current Isat as parameters. The determination unit inputs the DC superimposition characteristics slope [alpha] and the saturation current Isat into the simulation model(100) of the DC-DC converter and performs simulation, and determines whether or not the power inductor having the DC superimposition characteristics slope [alpha] and the saturation current Isat is usable on the basis of whether or not the simulation results satisfy design requirements (e.g, a permissible ripple voltage and a peak current).
Description
Technical field
The present invention relates to the evaluating apparatus of the power inductance that dc-dc is used, Yi Jigong
The assessment process of rate inductance.
Background technology
In recent years, in the electronic device, the low driving voltage of such as IC and the increase of circuital current
Change and improve, be widely used the DC of the excellent chopping way (on-off mode) of conversion efficiency
-DC transducer.The dc-dc main combination switch element of chopping way, power electricity
Sense, capacitor and diode etc. are constituted, and arbitrary DC voltage blood pressure lowering or boosting (are turned
Change) it is desired DC voltage.
In the design of dc-dc, in order to verify such as ripple voltage, the overcurrent limit
Deng design requirement, application circuit simulator, in the past, it is proposed that use power inductance DC-DC
The various analogy methods (for example, referring to non-patent literature 1,2) of transducer.
Non-patent literature 1:B.M Hasaneen and Adel A.Elbaset Mohammed,
" DESIGN OF SIMULATION OF DC/DC BOOST CONVERTER ",
Power System Conference, 2008.MEPCON 2008.12th International
Middle-East, IEEE, 12March 2008, p.334-340
Non-patent literature 2:Christophe Batard, Frederic Poitiers, Christophe
Millet and Nicolas Ginot, " MATLAB-A Fundamental Tool for
Scientific Computing and Engineering Applications-Volume1
(Chapter3) Simulaton of Power Converters Using Matlab-
Simulimk ", INTECH, 26Septmber 2012, p.43-68
But, owing to suppressing alternating current in dc-dc, make the merit that electric current smooths
In general rate inductance uses magnetic material, so having the superposition due to DC current and inductance change
Change the DC superposition characteristic (current dependence) of (reduction).But, in conventional simulation,
Preferable RLGC element (resistance R, electric capacity C, inductance L, conductance G) is utilized to make power electricity
Sense modelling, and do not consider DC superposition characteristic.
Therefore, using simulation, such as, considering that the important document such as ripple voltage, the overcurrent limit sets
Timing, needs to select and can ignore DC stacked spy in the actuating range of dc-dc
The power inductance of property.Its result, according to circumstances, needs to take the big surplus above to needs.
Summary of the invention
The present invention completes to eliminate the problems referred to above point, it is therefore intended that provide a kind of at DC
During the design of-DC transducer, it is not necessary to take big to needing above surplus, and be capable of merit
The evaluating apparatus of the optimized power inductance of selected, the design of rate inductance and power inductance
Assessment process.
The evaluating apparatus of power inductance involved in the present invention is characterised by possessing: memory element,
Its storage has the power electricity of slope and the saturation current comprising DC superposition characteristic as parameter
The equivalent-circuit model of sense, and simulate the circuit model of dc-dc；Accept unit,
It accepts and comprises the slope of the DC superposition characteristic becoming the power inductance judging object and saturated electricity
The input of the important document of at least any one party of flow valuve and permission ripple voltage and peak point current；With
And identifying unit, it is in the dc-dc of the equivalent-circuit model with power inductance
Circuit model introduces by accepting the slope of the DC superposition characteristic that unit accepts and saturation current value also
Carry out computing, and whether meet above-mentioned important document based on operation result, it is determined that can use that to have this straight
The slope of stream superimposed characteristics and the power inductance of saturation current value.
But, if full owing to exceeding for the bigger power inductance of the slope for DC superposition characteristic
With electric current (Isat) magnetic saturation the most at once, so inductance is dramatically reduced.On the other hand, due to
For the power inductance that the slope of DC superposition characteristic is less even more than saturation current electricity
The reduction of sense is also slow, so being not easy generation to run through phenomenon.Here, according to involved in the present invention
The evaluating apparatus of power inductance, it is possible to consider that the slope of the DC superposition characteristic of power inductance is sentenced
Can the most satisfied fixed desired important document, i.e. judge use this power inductance (DC superposition characteristic
Slope and saturation current value).Therefore, when the design of dc-dc, it is not necessary to take
Big to needing above surplus, and it is capable of selected, the optimization of design of power inductance.Its
As a result, it is possible to use the most small-sized power electricity being judged to use in conventional method
Sense, cheap power inductance.
In the evaluating apparatus of power inductance involved in the present invention, preferably memory element is according to each
Power inductance, by slope and the saturated electricity of this power inductance and the DC superposition characteristic of this power inductance
Flow valuve is set up association and stores, and acceptance form unit replaces the direct current becoming the power inductance judging object to fold
Add slope and the saturation current value of characteristic, and accept the input of the information determining this power inductance, sentence
Cell obtains from memory element and determines that with the merit accepted direct current corresponding to the information of rate inductance is folded
Add slope and the saturation current value of characteristic, it is determined that this power inductance can be used.
So, it is possible to determined that by input the information wanting the power inductance evaluated (is such as compiled
Number etc.), it is determined that this power inductance can be used.Therefore, it is possible to the direct current of not input power inductance
The slope of superimposed characteristics, saturation current value, and judge to use power inductance, it is possible to carry
The handling easiness of high user.
In the evaluating apparatus of power inductance involved in the present invention, the most above-mentioned power inductance etc.
Effect circuit model uses Fermi distribution function to carry out the slope of approximate DC superimposed characteristics.
So, it is possible to more suitably make the slope of nonlinear DC superposition characteristic approximate (table
Existing).
In the evaluating apparatus of power inductance involved in the present invention, preferably it is also equipped with comprehensive for many
Each and can using of judging of the slope of individual DC superposition characteristic and the combination of saturation current value
Result, obtain the group being judged to the slope of DC superposition characteristic and the saturation current value that can use
The acquiring unit of the guide look closed.
In the case of Gai, obtain the slope of DC superposition characteristic and saturated electricity being judged to use
The guide look of the combination of flow valuve, so user (designer of such as dc-dc) exists
During design dc-dc, it is possible to easily select more appropriate power inductance.
The evaluating apparatus of power inductance involved in the present invention is characterised by possessing: memory element,
Its storage has the power inductance of the actual measured value data comprising DC superposition characteristic as parameter
Equivalent-circuit model, and simulation dc-dc circuit model；Accept unit, its
Accept the actual measured value comprising the DC superposition characteristic becoming the power inductance judging object Part
Data and the operation condition of dc-dc and allow ripple voltage and peak point current
The input of the important document of at least any one party；And identifying unit, it has the equivalence of power inductance
The circuit model of the dc-dc of circuit model introduces and folds by accepting the direct current that unit accepts
Add the actual measured value data of characteristic to go forward side by side row operation, and based on operation result whether in above-mentioned action
Under the conditions of meet above-mentioned important document, judge to use this power inductance.
Evaluating apparatus according to power inductance involved in the present invention, it is possible to use and become judgement object
The actual measured value data of the DC superposition characteristic of the power inductance of parts, it is determined whether in regulation
Meet desired important document under operation condition, i.e. consider the slope of the DC superposition characteristic of power inductance
Can judgement use this power inductance.Therefore, when the design of dc-dc, it is not required to
Take big to needing above surplus, and be capable of selected, the optimization of design of power inductance.
It is as a result, it is possible to use the most small-sized power being judged to use in conventional method
Inductance, cheap power inductance.
In the evaluating apparatus of power inductance involved in the present invention, preferably memory element is according to each
Power inductance, by the actual measured value number of this power inductance Yu the DC superposition characteristic of this power inductance
According to setting up association and storing, the replacement of acceptance form unit becomes the DC stacked of the power inductance of judgement object
The actual measured value data of characteristic, and accept the input of the information determining this power inductance, it is determined that single
Unit obtains the DC stacked spy corresponding with the information of the determination power inductance accepted from memory element
Property actual measured value data, and judge can use this power inductance.
So, it is possible to determined that by input the information wanting the power inductance evaluated (is such as compiled
Number etc.), it is determined that this power inductance can be used.Therefore, it is possible to the direct current of not input power inductance
The slope of superimposed characteristics, saturation current value, and judge to use power inductance, it is possible to carry
The handling easiness of high user.
The evaluating apparatus of power inductance the most involved in the present invention is also equipped with: acquiring unit, and it is combined
Close the multiple results that can use changing the operation condition of dc-dc and judge, obtain
Take the scope of the operation condition of dc-dc being judged to use.
In the case of Gai, obtain the operation condition of dc-dc that is judged to use
Scope, so user (designer of such as dc-dc) is changed at DC-DC
During the design of device, it is possible to easily select more appropriate power inductance.
Now, in the evaluating apparatus of power inductance involved in the present invention, the most above-mentioned DC-
The operation condition of DC transducer comprises input voltage, output voltage, operating frequency and output
In electric current at least any one.
In the case of Gai, it is possible to obtain can use input voltage, output voltage, operating frequency,
Or the scope of output electric current.Therefore, user (designer of such as dc-dc)
When the design of dc-dc, it is possible to easily select more appropriate power inductance.
The assessment process of power inductance involved in the present invention is characterised by, makes computer as upper
The evaluating apparatus stating any one power inductance plays a role.
By performing the assessment process of power inductance involved in the present invention, computer is as power electricity
The evaluating apparatus (that is, memory element, accept unit, identifying unit and acquiring unit) of sense
Play a role.Its result, as described above, when the design of dc-dc, is not required to
Take big to needing above surplus, and be capable of selected, the optimization of design of power inductance.
According to the present invention, when designing dc-dc, it is not necessary to take and arrive greatly more than needs
Surplus, and it is capable of selected, the optimization of design of power inductance.
Accompanying drawing explanation
Fig. 1 is the frame of the composition of the evaluating apparatus representing the power inductance involved by the first embodiment
Figure.
Fig. 2 is to represent that the evaluating apparatus applying the power inductance involved by the first embodiment is made
The example of circuit model of dc-dc of equivalent-circuit model of power inductance
The figure of son.
Fig. 3 is the figure of the example of the DC superposition characteristic (slope) representing power inductance.
Fig. 4 is the power inductance of the evaluating apparatus representing the power inductance involved by the first embodiment
Evaluation process the flow chart of processing sequence of (determination processing could be used).
Fig. 5 is the figure of the analog result (peak point current Ipeak) representing embodiment (condition 1).
Fig. 6 is the figure of the analog result (peak point current Ipeak) representing embodiment (condition 2).
Fig. 7 is the frame of the composition of the evaluating apparatus representing the power inductance involved by the second embodiment
Figure.
Fig. 8 is to represent that the evaluating apparatus applying the power inductance involved by the second embodiment is made
The example of circuit model of dc-dc of equivalent-circuit model of power inductance
The figure of son.
Fig. 9 is the power inductance of the evaluating apparatus representing the power inductance involved by the second embodiment
Evaluation process the flow chart of processing sequence of (determination processing could be used).
Figure 10 is the block diagram of the composition of the computer representing the assessment process performing power inductance.
Detailed description of the invention
Hereinafter, referring to the drawings being preferred embodiment described in detail to the present invention.Additionally,
In figure, same or suitable part is used same symbol.It addition, in the various figures, to same
Also the repetitive description thereof will be omitted for the additional same symbol of key element.
First embodiment
First, use Fig. 1 to the evaluating apparatus 1 of the power inductance involved by the first embodiment
Composition illustrates.Fig. 1 is the block diagram of the composition of the evaluating apparatus 1 representing power inductance.Fig. 2
It it is the equivalent-circuit model of the power inductance that the evaluating apparatus 1 representing and applying power inductance is used
The figure of an example of circuit model (analogue model) of dc-dc.
The evaluating apparatus 1 of power inductance is when the design of dc-dc, supports and realizes merit
Selected, the optimizing device of design of rate inductance.To this end, the evaluating apparatus 1 of power inductance has
There are input receiving unit 10, information process unit 20 and display part 30.It addition, information processing
Unit 20 possesses storage part 21, detection unit 22 and acquisition unit 23.
Input receiving unit 10 such as, by keyboard, touch panel, instruction device and accept
Constitute from the outer input interface etc. of outside data input.Input receiving unit 10 accepts to become to be sentenced
Determine slope (inductance and the flowing in power inductance of the DC superposition characteristic of the power inductance of object
The slope that DC current reduces accordingly) α and saturation current value be (with the DC current that do not flows
Time compare inductance DC current values when reducing regulation ratio (such as 30%)) input of Isat.
Additionally, as described later, (such as number in the information being determined to become the power inductance judging object
Deng) corresponding with the slope of the DC superposition characteristic of this power inductance and saturation current value Isat
In the case of ground storage, replace slope and saturation current value Isat of DC superposition characteristic, be subject to
Reason portion 10 accepts the input of the information (numbering etc.) being determined to become the power inductance judging object.
It addition, input receiving unit 10 accepts includes that the design allowing ripple voltage and peak point current is wanted
The input asked.That is, input receiving unit 10 plays work as the unit that accepts described in technical scheme
With.
Additionally, generating the equivalent-circuit model 110 of power inductance described later and comprising such
During the circuit model 100 of dc-dc of effect circuit model 110, or, transplanting
These models of additionally generating when storing, input receiving unit 10 accepts the generation operation of model,
Or the graft procedure of model.The various information accepted by input receiving unit 10 export to information
Reason unit 20.
Information process unit 20 is at the equivalent-circuit model 110 comprising power inductance prestored
The circuit model 100 of dc-dc be introduced through the power of input receiving unit 10 input
The slope of the DC superposition characteristic of inductance and saturation current value Isat are also simulated, and based on being
No satisfied desired design requirement, is made as to whether to use the oblique of this DC superposition characteristic
The judgement (evaluation) of the group (power inductance) of rate α and saturation current value Isat.
Information process unit 20 is by carrying out the microprocessor of calculation process, storage for making this micro-
Reason device performs the ROM of information such as the program of each process, analogue model, hard disk (HDD), temporarily
Time the storage various data such as operation result RAM, keep its storage content by secondary cell etc.
Backup RAM and input and output I/F etc. constitute.In information process unit 20, logical
Cross the program being performed to be stored in ROM, HDD by microprocessor, it is achieved storage part 21, judgement
Portion 22 and the function of acquisition unit 23.
Storage part 21 such as, is made up of above-mentioned ROM, HDD etc., and storage is as parameter bag
Slope and saturation current value Isat containing the DC superposition characteristic accepted by input receiving unit 10
The equivalent-circuit model 110 of power inductance and there is the equivalent-circuit model of this power inductance
110, and simulate the circuit model (analogue model) 100 of dc-dc.That is, storage
Portion 21 plays a role as the memory element described in technical scheme.Additionally, storage part 21 also may be used
With according to each of multiple power inductances, DC stacked by this power inductance and this power inductance
The slope of characteristic and saturation current value Isat are set up association and prestore.
Here, the circuit of the dc-dc of the equivalent-circuit model 110 of power inductance is comprised
Model (analogue model) 100 is as shown in Figure 2.These models are for instance, it is possible to use and insult Li Erte
The LTspice that (Linear Technology) society provides generates.But it is also possible to replace these
Model, and use with other the model of simulator generation, numerical analysis based on mathematical equation
Method etc..
In the present embodiment, using the IC of the LTC3612 as the Ling Lierteshe controlling IC
Model 120 is applied in combination with the equivalent-circuit model 110 of power inductance.The equivalent electric of power inductance
Road model 110 is that the basic circuit of the characteristic in the case of reflecting not superposition direct current adds and will depend on
Element that is the voltage source model (electric current of voltage it is scaled according to the impact of L and R of curent change
Control voltage source) composition, it is possible to specify the slope of DC superposition characteristic and saturation current
Isat.It addition, in the present embodiment, Fermi distribution function is used to make the oblique of DC superposition characteristic
Rate α approximates.More specifically, consistent with the actual DC superposition characteristic measured with following formula (1)
Mode determine α.
[formula 1]
Here, L1It is initial inductance, L2Be saturated after inductance, Isat be inductance reduce by 30%
Time current value (saturation current value).It addition, β obtains according to following formula (2).
[formula 2]
Here, the example of the DC superposition characteristic (slope) of the power inductance obtained as described above
Son is as shown in Figure 3.The transverse axis of Fig. 3 is the DC current values (A) of flowing in power inductance, vertical
Axle is inductance (μ H).In fig. 3 it is shown that six kinds of power of slope different (α 1～α 32)
The DC superposition characteristic of inductance.In the example shown in Fig. 3, for each power inductance,
The slope of the inductance reduced due to the increase of DC current of flowing is different, but inductance reduces
Current value (saturation current value Isat) when 30% is identical value (3A).Additionally, here,
In conventional evaluation methodology, do not consider the difference of these slope, and merely with saturation current value
Can Isat judge use power inductance.
Return to Fig. 1, it is determined that portion 22 is at the DC of the equivalent-circuit model 110 with power inductance
The circuit model 100 of-DC transducer introduces slope and the saturation current of DC superposition characteristic
Whether value Isat is simulated (computing), and meet desired based on its simulation (computing) result
Design require (such as ripple voltage, peak point current etc.), it is determined that this can be used DC stacked
The slope of characteristic and the combination (power inductance) of saturation current value Isat.Namely it is decided that portion 22
Play a role as the identifying unit described in technical scheme.
Additionally, be determined to become the information (such as numbering etc.) of the power inductance judging object and be somebody's turn to do
The slope of the DC superposition characteristic of power inductance and saturation current value Isat store accordingly
In the case of, it is determined that portion 22 obtains and the information (example of the determination power inductance accepted from storage part 21
Such as numbering etc.) slope of corresponding DC superposition characteristic and saturation current value Isat, and judge
The slope of this DC superposition characteristic and combination (the power electricity of saturation current value Isat can be used
Sense).Additionally, the result of determination of detection unit 22 is exported to acquisition unit 23.
Acquisition unit 23 comprehensive (collecting) is for slope and the saturated electricity of multiple DC superposition characteristics
Can each and the result that use that judges of the combination of flow valuve Isat, obtain and be judged to use
The slope of DC superposition characteristic with the guide look of the combination of saturation current value Isat (with reference to described later
Table 2,3).That is, acquisition unit 35 plays a role as the acquiring unit described in technical scheme.This
Outward, it is determined that the result of determination in portion 22, the catalog obtained by acquisition unit 23 are exported to display part
30。
Display part 30 such as, is made up of LCD display etc., the judgement knot of display detection unit 22
Really, the catalog etc. obtained by acquisition unit 23.It addition, display part 30 displays that by input reception
The input data etc. that portion 10 accepts.
It follows that the action of the evaluating apparatus 1 of power inductance is illustrated with reference to Fig. 4.Fig. 4
Be the evaluating apparatus 1 representing power inductance power inductance evaluation process (can use at judgement
Reason) the flow chart of processing sequence.
In the step s 100, generate the equivalent-circuit model 110 of power inductance and have such
The circuit model 100 of the dc-dc of effect circuit model 110 (input voltage vin, defeated
Go out voltage Vout, operating frequency Freq, export electric current Iout) (or inputting from outside) deposit
Storage.
Then, in step s 102, ripple voltage and the peak that (appointment) can allow for is inputted
Value electric current etc..It addition, in step S104, input the DC stacked of (appointment) power inductance
The slope of characteristic and saturation current Isat.
It follows that in step s 106, there is the equivalent-circuit model 110 of power inductance
The analog circuit 100 of dc-dc introduces the slope of the DC superposition characteristic of power inductance
And saturation current Isat perform simulation.Then, whether meet based on simulation (computing) result
Can desired design requires (ripple voltage, peak point current etc.), judge use this direct current
The slope of superimposed characteristics and the combination (power inductance) of saturation current value Isat.
Then, in step S108, the slope of the DC superposition characteristic of scan power inductance with
And saturation current Isat, and identical with above-mentioned step S106, it is determined that can to use DC stacked
The slope of characteristic and the combination (power inductance) of saturation current value Isat.
Then, in step s 110, output obtains in step S106 and step S108
Can evaluation result (use slope and the combination of saturation current value Isat of DC superposition characteristic
Catalog (with reference to table 2,3)) etc., and be shown in display part 30.Afterwards, present treatment knot
Bundle.
Embodiment
Here, for two kinds of DC of the operation condition (condition 1, condition 2) having shown in table 1
-DC transducer, uses slope and saturation current value Isat of DC superposition characteristic, it is determined that energy
No use power inductance.Additionally, judge to employ the mould of the dc-dc shown in Fig. 2
Analog model 100.It addition, determinating reference is whether the peak point current Ipeak in power inductance reaches
Stop the carrying current (with reference to table 1) of the action of dc-dc.
[table 1]
| Condition 1 | Condition 2 | |
| Frequency | 3.2MHz | 1.6MHz |
| Input and output voltage | 4/2.0V | 4/2.0V |
| Inductance | 1.0μH | 2.2μH |
| Output electric current | 2A | 1.5A |
| Carrying current | 3.1A | 2.4A |
For condition 1, Fig. 5 illustrates that the saturation current Isat making power inductance is to export as maximum
Centered by 2 (A) of electric current, change between 1.5 (A)～2.5 (A), make DC stacked spy
The slope of property change between 1～32 in the case of, peak point current Ipeak in power inductance
Analog result.It addition, table 2 illustrates the power of the slope summarizing each DC superposition characteristic
The catalog that can use of inductance.
The transverse axis of Fig. 5 is saturation current Isat (A), and the longitudinal axis is peak point current Ipeak (A).As
Shown in Fig. 5, it is thus identified that in the case of the slope of DC superposition characteristic is below 2, even if making
Maximum current declines 500 (mA) saturation current value Isat and misoperation also will not be caused to make
With.It addition, saturation current value Isat confirming can use for each slope is different.
I.e., as shown in table 2, it is thus identified that in the case of slope is 8, though saturation current value
Isat is that 1.9 (A) also are able to use.It addition, confirm in the situation that slope is 1,2,4
Under, it also is able to use even if saturation current Isat is 1.5 (A).Additionally, do not considering slope
Conventional method in, saturation current Isat is all judged as below at 2.1 (A) can not
Use.
[table 2]
Similarly, for condition 2, Fig. 6 illustrate the saturation current Isat making power inductance using as
Centered by 1.5 (A) of maximum output current, change between 1.0 (A)～2.0 (A), and
The slope making DC superposition characteristic change between 1～32 in the case of, in power inductance
The analog result of peak point current Ipeak.It addition, table 3 illustrates summarizes each DC superposition characteristic
The catalog that can use of power inductance of slope.
The transverse axis of Fig. 6 is saturation current Isat (A), and the longitudinal axis is peak point current Ipeak (A).As
Shown in Fig. 6, it is thus identified that in the case of the slope of DC superposition characteristic is below 2, even if making
Maximum current declines 500 (mA) saturation current value Isat and misoperation also will not be caused to make
With.It addition, saturation current value Isat confirming can use for each slope is different.
I.e., as shown in table 3, it is thus identified that in the case of slope is 4, though saturation current value
Isat is that 1.2 (A) also are able to use.It addition, confirm in the case of slope is 1,2,
It also is able to use even if saturation current Isat is 1.0 (A).Additionally, do not considering slope
In conventional method, saturation current Isat is the most all judged as making at 1.4 (A)
With.
[table 3]
Above, as describe in detail, according to present embodiment, it is possible to consider power inductance
Can the slope of DC superposition characteristic determines whether to meet desired design requirement, i.e. use this
Power inductance.Therefore, when the design of dc-dc, it is not necessary to take big to need with
On surplus, and more appropriate power inductance can be selected.It is as a result, it is possible to use conventional
Method is judged to the most small-sized power inductance that can not use, cheap power inductance.
It addition, according to present embodiment, determined the information of the power inductance wanting evaluation by input
(such as numbering etc.), it is possible to judge to use this power inductance.Therefore, it is possible to not input work
The slope of the DC superposition characteristic of rate inductance, saturation current value Isat, and judge can make hard
Rate inductance, it is possible to improve the handling easiness of user.
According to present embodiment, owing to using Fermi distribution function to make the DC stacked spy of power inductance
Property slope approximation, it is possible to make the slope of the DC superposition characteristic of non-linear more appropriate
Ground approximation (performance).
According to present embodiment, owing to acquisition is judged to the slope of the DC superposition characteristic that can use
The guide look of the combination of α and saturation current value Isat, so user (such as dc-dc
Designer) design dc-dc time, it is possible to easily select more appropriate power
Inductance.
Second embodiment
In the evaluating apparatus 1 of the power inductance involved by the first above-mentioned embodiment, at DC
The slope of the circuit model 100 input direct-current superimposed characteristics of-DC transducer and saturation current
Isat but it also may be configured to the actual measured value of input direct-current superimposed characteristics.It addition, above-mentioned
Power inductance evaluating apparatus 1 in, it is determined that and export whether can use DC superposition characteristic
Slope and the group of saturation current Isat, but also be able to be configured to utilize above-mentioned DC superposition characteristic
Actual measured value (power inductance) judges the operation condition of the dc-dc that can use
The scope of (such as output electric current Iout) also exports.
Therefore, it follows that use in the lump Fig. 7,8, to involved by the second embodiment power electricity
The evaluating apparatus 2 of sense illustrates.Here, for the first above-mentioned embodiment involved by
The evaluating apparatus 1 of power inductance is the same or identical composition makes explanation simplify or omits, main
Difference is illustrated.Fig. 7 is to represent commenting of power inductance involved by the second embodiment
The block diagram of the composition of valency device 2.It addition, Fig. 8 is the evaluating apparatus representing and applying power inductance
The one of the circuit model of the dc-dc of the equivalent-circuit model of 2 power inductances used
The figure of individual example.Additionally, Fig. 7, in 8 to the structure identical or equal with the first embodiment
Key element is become to add identical reference.
The evaluating apparatus 2 of power inductance is replacing information process unit 20, and possesses information processing list
Unit's 20B this point is different from the evaluating apparatus 1 of above-mentioned power inductance.It addition, information processing
Unit 20B is replacing storage part 21 to possess storage part 21B, replaces detection unit 22 to possess and sentence
Determine portion 22B, replace acquisition unit 23 to possess these points of acquisition unit 23B, with information process unit
20 is different.Constituting as the evaluating apparatus 1 of above-mentioned power inductance or identical of other, institute
To omit detailed description here.
Input receiving unit 10 accepts the DC superposition characteristic becoming the power inductance judging object Part
Actual measured value data.Additionally, in the information (example being determined to become the power inductance judging object
Such as numbering etc.) deposit accordingly with the actual measured value data of the DC superposition characteristic of this power inductance
In the case of storage, input receiving unit 10 replaces actual measured value data, and accepts to be determined to become and sentence
Determine the input of the information (numbering etc.) of the power inductance of object.It addition, input receiving unit 10 is subject to
The operation condition of reason dc-dc and the permission design such as ripple voltage, peak point current
The input required.
Information process unit 20B is at the equivalent-circuit model comprising power inductance prestored
The circuit model 100B of the dc-dc of 110B introduces the DC stacked spy of power inductance
Property actual measured value data be simulated (computing), and based on regulation DC-DC turn
Whether meet desired design requirement under the operation condition of parallel operation, be made whether to use this
The judgement (evaluation) of power inductance.It addition, the operation condition of scanning dc-dc, enter
The identical judgement of row, and with certain power inductance as object, obtain the ripple of power inductor current with
And the guide look of the dc-dc of the satisfied desired specification of peak point current in power inductance.
The actual measurement of the DC superposition characteristic that storage part 21B storage is accepted by input receiving unit 10
Value Data and have the actual measured value data of DC superposition characteristic can be specified as parameter
The equivalent-circuit model 110B of power inductance, and simulate the circuit model (mould of dc-dc
Analog model) 100B.Additionally, storage part 21B can also according to each of multiple power inductances,
The actual measured value data of this power inductance with the DC superposition characteristic of this power inductance are set up and closes
Join and prestore.
Here, Fig. 8 illustrates that the DC-DC of the equivalent-circuit model 110B comprising power inductance turns
Circuit model (analogue model) 100B of parallel operation.The circuit model 100B of dc-dc
Relative to above-mentioned circuit model 100, it is possible to process the actual measured value data of DC superposition characteristic.
Additionally, in the circuit model 100B of dc-dc, for instance, it is possible at as variable
Reason the input voltage vin of dc-dc, output voltage Vout, operating frequency Freq,
The operation conditions such as output electric current Iout.But it is also possible to replace these models, and use with it
The model that its simulator generates, numerical analysis method based on mathematical equation etc..
Detection unit 22B is in the DC-DC conversion of the equivalent-circuit model 110B with power inductance
The circuit model 100B of device introduces the actual measured value data of DC superposition characteristic and is simulated (fortune
Calculate), and simulate (computing) result operation condition in the regulation of dc-dc based on it
Whether meet desired design under (such as output electric current Iout etc.) to require (such as can permit
Ripple voltage perhaps, peak point current etc.), it is determined that this power inductance can be used (to judge object portion
Part).
Additionally, be determined to become the information (such as numbering etc.) of the power inductance judging object and be somebody's turn to do
In the case of the actual measured value data of the DC superposition characteristic of power inductance store accordingly, sentence
Determine portion 22B (such as to number from the information of storage part 21B acquisition with the determination power inductance accepted
Deng) the actual measured value data of corresponding DC superposition characteristic, and judge to use this direct current to fold
Add the actual measured value data (power inductance) of characteristic.Additionally, the result of determination of detection unit 22B
It is exported to acquisition unit 23B.
Acquisition unit 23B comprehensive (collecting) changes the operation condition of dc-dc and judges
The multiple results that can use, obtain the dynamic of the dc-dc that is judged to use
Make the scope (with reference to table 6 described later) of condition.Additionally, the result of determination of detection unit 22B, by
The catalog that acquisition unit 23B obtains is exported to display part 30.
It follows that the action of the evaluating apparatus 2 of power inductance is illustrated with reference to Fig. 9.Fig. 9
Be the evaluating apparatus 2 representing power inductance power inductance evaluation process (can use at judgement
Reason) the flow chart of processing sequence.
In step s 200, generate the equivalent-circuit model 110B of power inductance and there is this
The analog circuit 100B of the dc-dc of equivalent-circuit model 110B (input voltage vin,
Output voltage Vout, operating frequency Freq, exports electric current Iout) (or from outside input) and
Storage.
Then, in step S202, the operation condition of input (appointment) dc-dc
The design such as (such as output electric current Iout) and the ripple voltage that can allow for, peak point current is wanted
Ask.It addition, in step S204, the DC superposition characteristic of input (appointment) power inductance
Actual measured value data.
It follows that in step S206, at the DC-DC of the equivalent circuit with power inductance
The analog circuit 100B of transducer introduces the actual measured value number of the DC superposition characteristic of power inductance
According to and perform simulation (computing).Then, the most dynamic specify based on simulation (computing) result
Make to meet desired design under condition (such as output electric current Iout) and require (ripple voltage, peak
Value electric current etc.), it is determined that actual measured value data (the power electricity of this DC superposition characteristic can be used
Sense).
Then, in step S208, the operation condition of scanning dc-dc, and with upper
Can step S206 stated be identical, it is determined that use the actual measured value data (merit of DC superposition characteristic
Rate inductance).
Then, in step S210, output is in commenting that step S206 and step S208 obtain
Valency result (can use the scope (ginseng of the operation condition of the dc-dc of power inductance
According to table 6) etc., and it is shown in display part 30.Thereafter, present treatment terminates.
Embodiment
Here, as shown in table 4, with size, saturation current Iast and DC superposition characteristic
The different six kinds of power inductances (sample 1～6) of slope are object, for the DC shown in table 5
The specification (condition) of-DC transducer, calculates and disclosure satisfy that carrying current (is set as exporting electric current
+ 1A) the scope of output electric current Iout.Additionally, judge to employ the DC-shown in Fig. 8
The analogue model 100B of DC transducer.
[table 4]
| Size | L[μH] | Isat[A] | Slope | |
| Sample 1 | 2016 | 1 | 1.5 | 2 |
| Sample 2 | 2016 | 1 | 1.5 | 20 |
| Sample 3 | 2520 | 1 | 2 | 2 |
| Sample 4 | 2520 | 1 | 2 | 20 |
| Sample 5 | 3216 | 1 | 2.5 | 2 |
| Sample 6 | 3216 | 1 | 2.5 | 20 |
[table 5]
| Condition 1 | |
| Frequency | 3.2MHz |
| Input and output voltage | 4/2.0V |
| Inductance | 1.0μH |
| Output electric current Iout | Variable |
| Carrying current | Output electric current+1A |
By simulation, the result calculating the output electric current Iout less than carrying current is as shown in table 6.
As shown in table 6, the sample 1 (Isat1.5A, α 2) that such as slope is less is in conventional evaluation
In can only use 1.5 (A), but in the evaluation of the present embodiment, it is thus identified that 2.25 can be used
(A).It addition, sample 3 (Isat2A, α 2) is merely able to use to 2 (A) in conventional evaluation,
But in the evaluation of the present embodiment, it is thus identified that 2.75 (A) can be used.Similarly, sample 5
(Isat2.5A, α 2) is merely able to use to 2.5 (A) in conventional evaluation, but in this enforcement
In the evaluation of example, it is thus identified that 3.0 (A) can be used.Additionally, also confirm at slope relatively
In big sample 2,4,6, it is merely able in the scope identical with conventional evaluation use.
[table 6]
As described above, according to present embodiment, it is possible to use and become the power judging object Part
The actual measured value data of the DC superposition characteristic of inductance determine whether the operation condition in regulation
Meet desired design requirement under (specification), i.e. consider the DC superposition characteristic of power inductance
Can slope judge use this power inductance.Therefore, when the design of dc-dc,
Need not take the big surplus above to needs, and more appropriate power inductance can be selected.Its result,
The most small-sized power inductance, honest and clean being judged to use in conventional method can be used
The power inductance of valency.
It addition, according to present embodiment, determined the information of the power inductance wanting evaluation by input
(such as numbering etc.), it is possible to judge to use this power inductance.Therefore, in the case of being somebody's turn to do, energy
The actual measured value data of enough not DC superposition characteristics of input power inductance, and judge to use
Power inductance, it is possible to improve the handling easiness of user.
Particularly, according to present embodiment, owing to obtaining the DC-DC being judged to use
The scope of the operation condition (specification) of transducer, so user (such as DC-DC conversion
The designer of device) when designing dc-dc, it is possible to easily select more appropriate merit
Rate inductance.
It follows that with reference to Figure 10, to making the computer evaluating apparatus 1 as above-mentioned power inductance
The assessment process of the power inductance that (or 2) play a role illustrates.Figure 10 be represent for
Perform the block diagram of the composition of the computer 5 of the assessment process of power inductance.
Computer 5 possesses the control portion of the execution etc. of the assessment process 52 controlling power inductance
(CPU) 50, the hard disk 51 of assessment process 52 etc. of power inductance, memorizer (RAM) are stored
53, the display part 54, the input unit 55 being made up of keyboard etc. that are made up of display etc., can read
Take the reading device 56 of the program etc. being recorded in the record media such as CD-ROM, by LAN net
The LAN interface 57 that card is constituted.Here, such as, read also by reading device 56 by execution
Storage (installation) is in the assessment process 52 of the power inductance of hard disk 51, and computer 5 is as composition
The input receiving unit 10 of the evaluating apparatus 1 of above-mentioned power inductance, storage part 21 (21B), sentence
Determine portion 22 (22B), acquisition unit 23 (23B) and display part 30 to play a role.
According to present embodiment, by performing the assessment process 52 of power inductance, computer 5 conduct
The evaluating apparatus 1 of power inductance (that is, input receiving unit 10, storage part 21, detection unit 22,
And acquisition unit 23) play a role.Its result, as described above, turns at design DC-DC
During parallel operation, it is not necessary to take big to needing above surplus, and be capable of power inductance selected,
The optimization of design.
Above, embodiments of the present invention are illustrated, but the present invention is not limited to above-mentioned
Embodiment and various deformation can be carried out.Such as, in the above-described embodiment, Fermi is used
Distribution function makes the slope of DC superposition characteristic approximate, but approximation method (the performance side of slope
Method) be not limited to use Fermi distribution function method.
It addition, in the above-described 2nd embodiment, the actual measured value number of DC superposition characteristic is used
According to, obtain the actuating range of the dc-dc that can use but it also may be configured to make
By slope and saturation current value Isat of DC superposition characteristic, obtain the DC-that can use
The actuating range of DC transducer.
Reference numeral explanation
1,2 ... the evaluating apparatus of power inductance, 5 ... computer, 10 ... input receiving unit, 20,20B ...
Information process unit, 21,21B ... storage part, 22,22B ... detection unit, 23,23B ... obtain
Portion, 30 ... display part, 50 ... control portion, 51 ... hard disk, 52 ... the assessment process of power inductance,
53 ... memorizer, 54 ... display part, 55 ... input unit, 56 ... reading device, 100,100B ... DC
The circuit model (analogue model) of-DC transducer, 110,110B ... the equivalent electric of power inductance
Road model.
Claims (9)
1. the evaluating apparatus of a power inductance, it is characterised in that possess:
Memory element, the equivalent-circuit model of its storage power inductance, and simulate DC-DC and turn
The circuit model of parallel operation, this power inductance have comprise DC superposition characteristic as parameter slope,
And saturation current；
Accepting unit, it accepts and comprises the DC superposition characteristic becoming the power inductance judging object
Wanting of at least any one party of slope and saturation current value and permission ripple voltage and peak point current
The input of part；And
Identifying unit, it turns at the DC-DC of the equivalent-circuit model with above-mentioned power inductance
The circuit model of parallel operation introduces by the above-mentioned slope accepting the DC superposition characteristic that unit accepts and satisfies
Go forward side by side row operation with current value, and whether meet above-mentioned important document based on operation result, it is determined that can make
With slope and the power inductance of saturation current value with this DC superposition characteristic.
The evaluating apparatus of power inductance the most according to claim 1, it is characterised in that
Said memory cells according to each power inductance, straight by this power inductance and this power inductance
Slope and the saturation current value of stream superimposed characteristics are set up association and store,
As the slope of DC superposition characteristic and the saturation current that become the power inductance judging object
The replacement of value, the above-mentioned unit that accepts accepts the input of the information determining this power inductance,
Above-mentioned identifying unit obtains and the above-mentioned power inductance of determination accepted from said memory cells
The slope of DC superposition characteristic corresponding to information and saturation current value, judge to use this merit
Rate inductance.
3. according to the evaluating apparatus of the power inductance described in claims 1 or 2, it is characterised in that
The equivalent-circuit model of above-mentioned power inductance uses Fermi distribution function to carry out approximate DC superposition
The slope of characteristic.
4. according to the evaluating apparatus of the power inductance described in any one in claims 1 to 3, its
It is characterised by, is also equipped with:
Acquiring unit, it is comprehensively for slope and the group of saturation current value of multiple DC superposition characteristics
Can each and the result that use that judges closed, obtain the DC stacked spy being judged to use
Property the guide look of combination of slope and saturation current value.
5. the evaluating apparatus of a power inductance, it is characterised in that possess:
Memory element, the equivalent-circuit model of its storage power inductance, and simulation DC-DC turn
The circuit model of parallel operation, this power inductance has the actual survey comprising DC superposition characteristic as parameter
Magnitude data；
Accepting unit, it accepts and comprises the DC stacked spy becoming the power inductance judging object Part
Property actual measured value data and the operation condition of dc-dc and allow ripple electricity
The input of the important document of at least any one party of pressure and peak point current；And
Identifying unit, it turns at the DC-DC of the equivalent-circuit model with above-mentioned power inductance
The circuit model of parallel operation introduces by the above-mentioned actual measurement accepting the DC superposition characteristic that unit accepts
Value Data is gone forward side by side row operation, and whether meets above-mentioned wanting under above-mentioned operation condition based on operation result
Can part, judge use this power inductance.
The evaluating apparatus of power inductance the most according to claim 5, it is characterised in that
Said memory cells according to each power inductance, straight by this power inductance and this power inductance
The actual measured value data of stream superimposed characteristics are set up association and store,
Actual measured value data as the DC superposition characteristic becoming the power inductance judging object
Replacement, the above-mentioned unit that accepts accepts the input of the information determining this power inductance,
Above-mentioned identifying unit obtains and the above-mentioned power inductance of determination accepted from said memory cells
The actual measured value data of DC superposition characteristic corresponding to information, judge to use this power
Inductance.
7. according to the evaluating apparatus of the power inductance described in claim 5 or 6, it is characterised in that
It is also equipped with:
Acquiring unit, it comprehensively changes the operation condition of above-mentioned dc-dc and judges
Can the multiple results that use, acquisition be judged to the action of the dc-dc that can use
The scope of condition.
The evaluating apparatus of power inductance the most according to claim 7, it is characterised in that
The operation condition of above-mentioned dc-dc includes input voltage, output voltage, action
Frequency and output electric current at least any one.
9. the assessment process of a power inductance, it is characterised in that
Make computer as the evaluating apparatus of the power inductance described in any one in claim 1～8
Play a role.
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| JP2015018740A JP6245187B2 (en) | 2015-02-02 | 2015-02-02 | Power inductor evaluation apparatus and power inductor evaluation program |
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| CN109375118A (en) * | 2018-10-15 | 2019-02-22 | 威创集团股份有限公司 | Current measuring device and current measurement system |
| CN115980493A (en) * | 2023-01-03 | 2023-04-18 | 广州市德珑电子器件有限公司 | Multi-inductor photovoltaic inverter testing method, device, equipment and storage medium |
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| JP6245187B2 (en) | 2017-12-13 |
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| US10120037B2 (en) | 2018-11-06 |
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